NEET PG DENTAL EXAM

EMBRYOLOGY

RESPIRATORY SYSTEM

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Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]

In the process of breathing, during what stage does the movement of the diaphragm enlarge the thoracic cavity?

A	Internal respiration
B	External respiration
C	Inspiration
D	Experation

Explanation:

Detailed explanation-1: -The first phase is called inspiration, or inhaling. When the lungs inhale, the diaphragm contracts and pulls downward. At the same time, the muscles between the ribs contract and pull upward. This increases the size of the thoracic cavity and decreases the pressure inside.

Detailed explanation-2: -During the process of inhalation, the lung volume expands as a result of the contraction of the diaphragm and intercostal muscles (the muscles that are connected to the rib cage), thus expanding the thoracic cavity. Due to this increase in volume, the pressure is decreased, based on the principles of Boyle’s Law.

Detailed explanation-3: -During inhalation, the anterior-posterior, vertical, and transverse dimensions of the thorax are increased. Contraction of the dome-shaped diaphragm causes the central tendon to be pulled inferiorly, flattening the diaphragm and increasing the vertical dimensions of the thorax.

There is 1 question to complete.